Dynamo-electric machine.



Patented Mar. 27, won. B. G.-L'AMME.Y DYNAMO ELECTRIC MACHINE.

(Application filed Jana 80, 1899.) (No Model.)

WITNESSES lNVENTO ATTORNEY.

m: uumus wnzns co. Puovoumm WASHINGTON. n. c.

BENJAMIN e. LAMME, on PITTSBURG, PENNSYLVANIA, ASSIGNOR o THE WESTINGHOUSE ELECTRIC AND MANUFAoTUEiNe COMPANY,

OF PENNSYLVANIA.

SPECIFICATION forming part of Letters Patent No. 646,092, dated March 2 7, 1906.

Application filed June 30,1899. berial No. 722,360. (No model.)

To aZl whom it may concern:

Be it known that I, BENJAMIN G. LAMME, a citizen of the United States, residing'at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dynamo-Electric Machines, (Case No. 841,) of which the following is a specification.

My invention relates to dynamo-electric machines; and it has for its object to provide a simple and efficient means for balancing the magnetic circuits of such machines.

It is sometimes found in practice that both alternating and direct current electric generators having two-circuit or series windings and alternating-current generators having open-coil windings have unbalanced magnetic circuits due to one or more of a variety of causessuch, for example, as the unequal wear of bearings and consequent displacement of the armature with reference to the poles of the field-magnet, defective castings, unequal field-magnet coils, an unequal rate of increase or decrease of the polar strengths due to changes in load, the.

It is important that the poles of a m ultipolargenerator, whether of the direct or alternating current type, should be of substantially the same strength in order that they may'exert the same magnetic effect upon the armature. In order to equalize the magnetic circuits, and. thus avoid any distortion, either mechanical or magnetic, I propose to provide the armature With a winding or windings each closed upon itself and each independent of the main generating-windings of the ma chine. If the generating portions of these closed windings are symmetrically located with reference to the poles of the machine, leading and lagging currents will be generated therein, which will be transmitted through the external connections from one portion to another, so as to produce the balancing effect desired.

In the accompanying drawings, illustrating myinvention, Figure 1 is an end elevatiompan tially diagrammatic, of a generator provided with balancing-windings in accordance with my invention. Fig. 2 is a diagram representing a development of the armature of the ma 1 chine shown in Fig. 1, the outline of the armature and the field-magnet pole-pieces being indicated by broken lines and the main coils of both the armature and field-magnet being omitted.

The subject-matter of my invention, as illustrated in the drawings, is as followsi The generator 1 is provided with a field-magnet frame 2, having eight pole-pieces 3, provided with a magnetizing-winding 4:, as has been already indicated;

This machine may be designed for the gen eration of either direct or alternating cur rents and may have any number of field-magnet pole-pieces "found convenient and desirable. Ihe armature 5 is shown as of the or dinary slotted-drum type, having main gen crating-windings 6, located in said slots and properly arranged and connected in a manner well known in the art. Suitably located at equidistant points around the armature are supplemental balancing -condu'ctors 7 there being four of these conductors,as shown, this number being adapted to an eight-pole machine. A different number of poles would obviously require for symmetrical arrangement a different number of these supplemental balancing-conductors. The conductors 7 are connected together at one end bya ring 8 and at the other end by a ring 9, so that the currents generated in each of said conductors may be transmitted to any or all of the others.

The balancing effect of the means thus far described is pulsating in character, and con= sequently the adjustment may not be as good as is desired. I therefore find it advisable to employ another set of supplemental balanc ing conductors 10, also symmetrically 'ar ranged and alternating in position with the conductors '7. These conductors 10 are connected together at one end by a ring 11 and at the other end by a ring 12 for reasons already stated in connection with the other closed winding. With the two windings arranged as shown a fairly uniform balancing effect will be obtained; but it is ofcourse feasible to employ more of these closed wind ings symmetrically located if a closer adj ustment is found necessary or desirable. I have shown the generating-conductors of these windings as located in the same slots as certain of the main windings 0f the armature, such slots being made slightly deeper to accommodate the additional conductor; but it will be understood that these supplemental conductors may be placed in separate slots or otherwise located in the main slots of the armature, if desired.

I claim as my invention- 1. In adynamo-electric machine having the usual fiel(11nagnet and armature windings, means for balancing the magnetic circuits comprising an auxiliary armaturewinding closed upon itself and having generating-conductors symmetrically located with reference to thefield-magnet poles.

2. In a dynamo-electric machine having the usual field-1nagnet and armature windings,

Witnesses:

JAMES YOUNG, II. C. Tnnnni 

